Steam generator for a batch oven



FIG. 1 is a perspective view of a steam generator for a batch oven showing my new design;

FIG. 2 is a top plan view thereof, the bottom view being identical;

FIG. 3 is a side elevational view thereof; and,

FIG. 4 is an end elevational view thereof. 

The ornamental design for a steam generator for a batch oven, as shown. 